Year	Measure
1971	0.01281
1972	0.0128
1973	0.0124
1974	0.01343
1975	0.01421
1976	0.01338
1977	0.01266
1978	0.01262
1979	0.01272
1980	0.01288
1981	0.01659
1982	0.01816
1983	0.01809
1984	0.01833
1985	0.01952
1986	0.0193
1987	0.01889
1988	0.01924
1989	0.01935
1990	0.01875
1991	0.01833
1992	0.01803
1993	0.0182
1994	0.01701
1995	0.01698
1996	0.01726
1997	0.01817
1998	0.01789
1999	0.01871
2000	0.01888
2001	0.01862
2002	0.01667
2003	0.01807
2004	0.01964
2005	0.01848
2006	0.01865
2007	0.01803
2008	0.0194
2009	0.01801
2010	0.01869